Paper-bag machine



2 Sheets-Sheen; 2

W. C. GROSS. Paper-Bag Machine.

Ptenfed Ma. 16.1880.

INVENTOR Wiliam f vraA-f,

WITNEss'Es I ATTORNEY.

NAPETERS, PKUTULn-HGiAP/ER. WASHINGTON. D` C.

UNITED STATES PATENT OFFICE..

WILLIAM O. CROSS, OF BOSTON, MASSACHUSETTS.

PAPER-BAG MACHINE.

SPECIFICATION forming part of Letters Patent No. 225,509, dated March 16, 1880.

Application led December 22, 1879.

`and `described `in my Letters Patent No.

221,531, dated November 11, 1879.

In common with the said patented machine my present mechanism comprises a rotating nipper, whichl acts to take hold of one ply of the blank, and is combined with a guide rod or bar within the blank, which upholds that ply of the blank which is not seized by the nipper, and I also combine with the said devices means for continuously feeding the paper tube or blank.

In lieu, however, of using a cylinder to carry the nipper, I now mount said nipper upon a rotating bar or rod eccentrically hung or mounted in the frame ofthe machine, as hereinafter shown and described.

By this modification of my patented arrangement I am enabled to combine with the nipping or grasping `inechanism and with the longitudinal upholding-bar a reciprocatory foldguide, which moves back and forth in the line of feed, and furnishes an edge, over which is folded that ply which is grasped and drawn back by the nipper.

I also make use of a retaining-lin ger, which bears on the folded back ply and retains the diamond fold in a position in which it will en ter and pass through the delivery-rolls properly.

These and other features of my invention can best be explained and understood by reference to the accompanying drawings, in which- Figure l is aplan of machinery embodying my invention. Fig. 2 is a longitudinal vertical central section of the same; Fig. 3 is a perspective 'view of the nipper-bar and cam detached. Fig. 4 isa cross-section of the longitudinal guidefbar. ,Y Figs. 5, 6, and 7 are dia- `the delivery-rolls E F.

grams representing the blank and the parts operating' thereon in the different positions which they assume during the formation of the diamond fold.

The various working parts of the machin are supported in a suitable frame, G.

I make use, in order to produce the paper tube from which the bag-lengths are cut, of a trunk or former, H. around which the paper tube is formed in the usual way-that is to say, a sheet vor ribbon of paper of proper width is conducted to and folded around said trunk or former `and is pasted along its overlapping edges.

The instrumentalities for making the tube are well known and require no further explanation. v

Attached to the front of the trunk H is the guide-bar I, which is a narrow metallic strip extending between the feed-rolls A B upto The bar on its under side is recessed, as shown at 1'-, said recess forming a passage between the guide-bar and the under ply of the blank, through which the beak or point of the `nipper can enter the mouth of the blank, in order to take hold of said ply. p

The rolls A B are the feed-rolls. They draw forward the tube which is formed on the trunk H, and' are grooved centrally for the passage of the guide-bar I, around which the paper tube passes;

In advance of the feed-rolls is the rotary nipper-bar D, which is arranged under guide-bar I, and has journals D eccentrically placed and supported in proper bearings in the frame G. This bar carries the nipper or jaw or equivalent device to engage or take holdof the adjoining fly of the paper blank. This device consists, in the present instance, of a hook-like jaw or nipper, a, which is attached to a rock-shaft, c, supported in proper bearings in the recess b in the nipper-bar, and is provided at one end with a radial arm, cl, from which projects a crankpin or roller-stud, c. This roller-stud travels over the periphery of a cam, f, which is xed to the frame of the machine. A spring, h, holds the stud e against the periphery of the cam.

The parts are arranged for operation substantially as described in my aforesaid Letters IOO Patent-that is to say, when the cylinder `is in rotation the shaft c has a rocking motion, by which a vibratory movement is imparted to the nipper, causing it at proper times to grasp the under ply of the blank, which is held between the nipper and the bed or stationary jaw ct of the nipper-bar, and then after a proper interval to recede from the bed a and release the ply.

In advance of the nipper are the deliveryrolls E F, which deliver the diamond-folded blank to the subsequent mechanism for making the second and final folds needed to complete the Satchel-bottom; orv they may form a part of such mechanism. They are here shown in order to indicate how the blank may be taken from the diamond-fold-iorming mechanism.

In order to in sure that the body of the blank shall move forward continuously an d uniformly during the making` of the diamond fold, I place above the guide-bar I an endless belt, J, between which and the guide-bar passes the upper ply of the tube. This belt, which may be arranged in various ways, is here shown as passing around and extending between the upper delivery roll, E, and the roll C, which is placed directly above the nipper-bar D. The latter roll is not indispensable. If it be not usedthe feed-belt- J mayextend between the upper feed-roll, A, and the delivery-roll E; and even if it be used the feed-belt need not pass around it, but may extend around a small idle-roll, which can be placed just in advance of the said roll C. The roll C, however, serves a useful purpose, in that it bears on and carries forward the blank at the point where the under ply is taken hold of by the nipper, and so insures the more uniform progression of the blank. I can also make use of it to cut or sever the bag-lengths, it being provided, as shown, with a transverse cutting blade, j, which is adapted to move in a radial groove in the roll, and is provided at its ends with projecting studs 7c, which work in cam-grooves L on the frame ofthe machine, so arranged as to cause the blade to project from and to draw back within the roll at the proper times. On that edge of the bar-D which is overhung by the nipper is a groove or slot, m, which meets and is entered by the cutter-blade.

When the parts U D are in rotation the cuttin g-blade, as it comes opposite the slot improjects from the cylinder C and severs the blank, all save the narrow central portion opposite the guide-bar I, at which point the cutter-blade is recessed, so as to permit it to pass down below the guide-bar. This narrow strip of the paper blank which cannot be acted on by the cutterblade can, however, be previously cut by a small centrally-arran ged rotary cutter mounted in or on the former H, as will readily be nnderstood. The cutter-blade acts just a little in advance of the time at which the nipper moves to enter the mouth of the blank.

Various forms, however, of cutting or sev- ,-ering devices may be employed. Any of those which are used in bag machinery may be ap plied to my machine without trouble.

Vfor example, shown in Fig. 2.

In connection with the rotary nipper-bar I employ a reciprocating fold-guide, K, which is a metallic strip with a straight front edge, mounted at its ends in suitable horizontal ways n in or on the sides of frameG, which support and guide it in its back-and-forth movement. Its back-and-forth movement manifestly can be obtained in many ways. The means shown in the drawings consist of a rockshaft, L, having a radial arm, o, to which is jointed the pitman p, which at its other end straddles the cam-shaft M, and is provided with a roller-stud, r, held against the periphery of cam s on said shaft by a spring, t. At opposite ends of the rock-shaft L are radial arms e, which, by connecting-rods w, communicate movement to the fold-guide K. The movement of the fold-guide is such that when the nipper has grasped the under ply the front edge of the fold-guide is up to the line on which the said ply is to be folded. The foldguide moves forward in unison with the blank during the folding operation, and instantly retires as soon as the nipper releases the ply, to again move forward with the blank as before.

The retaining-fin ger hereinbefore referred to is shown at N. Its oce is to hold back the rear ap of the diamond fold after its release from the nipper. It may be arranged for this purpose in various ways, and may be either elastic or yielding, as shown in the drawings, or non-elastic. It is necessarily yielding when arranged as shown, in order to permit the unobstructed rotary movement of the nipper-bar, which, as it revolves, comes intermittently in contact with the retaining-finger and presses it downward. As soon as the nipper passes the finger the latter returns to its normal position.

It will be noted by reference to Fig. 3 that the journals ofthe nipper-bar are eccentrically placed, so that that edge only of the bar which is overhung by the nipper will come in contact with the blank.

The operation of the machine is as follows: The movements of the parts are so timed that the mouth or front end of the bag-blank will come between the nipper-bar and the roll C when the nipper is uppermost-in the position,

This will naturally follow from the employment of a cutter arranged as shown in the drawings. The parts being in continuous motion, as the blank moves forward the nipper enters its mouth and clamps thev under ply, x, down upon the bedplate a. The reciprocating fold-guide has at the same time moved forward up to the line over which the ply is to be folded, as shown in diagram, Fig. 5. The body of the blank still moves forward, upheld by the guide-bar, the fold-guide moving in unison with the blank,

` while the under ply, held by the nipper, is, by

reason of the rotary movement of the nipperbar, folded back over the front edge of the fold-guide, as shown in diagram, Fig. 6, thus making the diamond fold. The nipper having done its work releases its hold on the IOO IIO

under ply, and at the same time the reciprocating fold-guide returns quickly to its original position, to again advance in unison with the tubular blank, as indicated in diagram, Fig. 7, while the retaining-finger holds in place the released rear iiap of the diamond fold, keeping the fold in posit-ion to pass properly and smoothly between the delivery-rolls. The feed-belt draws the blank along, and prevents it from being drawn back while the under ply is being acted on.

It will of course be understood that the various rotating devices herein described receive motion from a suitable prime mover, and are geared together so as to move at the requisite speed relatively to one another.

The guide-bar shown in the drawings is a stationary bar fixed to the trunk or former. It will, however, be understood that said bar may be a reciprocating bar, so that it can move back in rear of the cutter at the proper time to allow the cutter-blade to make its cut entirely across thewidth of the bag.

I use a pair of rotating devices, C D, for each size of bag, their diameter varying according to the varying size-as, for instance, a four-inch roll for a five-pound bag, a tWoand-three-quarter-inch roll for a three-pound bag, and so on. The gearing remains unchanged.

Having described my invention, whatI claim, and desire to secure by Letters Patent, is

I.A The combination, substantially as hereinbefore set forth, of the guide-bar, the rotary Dipper-bar and nipper carried by the same, and the reciprocating fold-guide.

2. The combination, substantially as hereinbefore set forth, of the guide-bar, the rotary nipper-bar and its nipper, the reciprocating fold-guide, and mechanism for continuously feeding along the paper tube or blank.

3. The combination, with a rotating nipping or grasping device and a guide-bar to uphold that ply of theblank which is not seized by the nippel', of a feed-belt, between which and the guide-bar the said ply passes and is carried along, substantially as set forth.

4. The combination, substantially as hereinbefore set forth, of the guide-bar, the rotary nipper-bar and its nipper, the reciprocating fold-guide, the feed-rolls, and the feed-belt.

5. The combination, substantially as hereinbefore set forth, of feed mechanism for continuously feeding the paper tube, the guidebar, the rotary nipper-bar and its nipper, the

reciprocating fold-guide, and the deliveringrolls. 6. In combination with the feeding mechanism, the guide-bar, the rotating nipping or grasping mechanism, and the reciprotating fold-guide, the fold-retaining iinger for holding the rear iiap of the diamond fold in place after it has been released from the nipper, substantially as hereinbefore set forth.

In testimony whereof I have hereunto set my hand this 19th day of December, 1879.

THOMAS SAVAGE, ADDISON J. SEAWARD. 

